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Babies born to mothers with greater 25-hydroxyvitamin D levels during the first trimester were substantially heavier and had bigger head circumferences at birth than those born to mothers with lower vitamin levels, a study showed. However, researchers found that maternal vitamin D levels did not correlate with ponderal index, placental weight or the placental-to-fetal weight ratio. The findings appear in the Journal of Clinical Endocrinology & Metabolism.

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People born between 1990 and 1999, sometimes referred to as Generation Z, enter the workforce with digital skills that make them ideal candidates for industries like advertising and marketing, William Craig writes. But their employers may have to cope with a lack of soft skills, such as punctuality and organization, Craig writes.

Elementary-school students in Haverford Township, Pa., have been using Everyday Mathematics for 15 years, but the upcoming transition to the Common Core State Standards has district officials considering new programs they say better align with the standards. Programs under consideration include Math in Focus, Singapore math and enVision Mathematics, officials told school board members during a recent meeting.

Traditional unions are on the decline, but there may be other options for worker representation, experts say. One alternative that has emerged is the Freelancers Union, which provides health benefits and performs advocacy. "We're going to have to evolve past the idea that the only thing a union is is a collective-bargaining agent at a workplace. There will be a lot more experimentation," Freelancers Union founder Sara Horowitz says.

The Planning Commission in Vista, Calif., was set this week to review changes to the city's sign ordinance that would ban sign spinners and vehicle-mounted signs. The proposed amendment classifies both as "mobile billboards," which would be prohibited.

Morning News Beat's Kevin Coupe reports from the Food Marketing Institute Midwinter Conference, where FMI president Tim Hammonds announced "Project Chill," an industry initiative to combat listeriosis, a food-borne illness. Attendees also listened to speeches from Coca-Cola's E. Nevill Isdell and a presentation of a McKinsey & Co. report about the growing influence of Wal-Mart.